of flint



- July 23, 1929. KAMRATH I 1,721,517

AIR CLEANER Fil ed May 11. 1925 Zlvmwntoz attoznmg nection with one specific type of cleaner it is to be understood that it is not limited to usetherewith but is capable of serving with equal effectiveness in many other relations.

I claim:

1. The combination of a cylindrical receptacle having an open end, an annular series of spirally arranged air directing blades in said end of the receptacle for imparting a whirling lllOtlOIl to the entering air stream in a direcsaid air directing blades extending inwardly from the periphery of the receptacle to points removed from the axisof the receptacle a distance greater than the radius of the air discharge port.

2. In combination with a fan, an air cleaner comprising a casing having an air admission opening facing away from the fan so that the heavier particles of dust in the air stream are carried beyond said opening by virtue of their greater inertia, means for imparting a whirling motion to the air stream entering said casing, a clean air discharge port in said casing, the interior of the casing being provided with a coating of dust retaining ma terial to catch particles of dust thrown outwardly by the whirling air stream.

In testimony whereof I affix my signature.

HERBERT Gr. KAMRATH. 

